There are many maths puzzles that have not been solved. Any puzzle that has an answer cannot be harder than one that mathematicians still have not solved. So a second hardest puzzle cannot exist.
Even amongst puzzles with answers, what you may consider hard may be easy to someone else, and conversely.
The hardest question is too difficult to conjure.
What is the exact value of pi in figures.
Different people find different problems hard and so it is not possible to answer the question.
Different people find different problems hard and so it is not possible to answer the question.
Different people find different problems hard and so it is not possible to answer the question.
The hardest question is too difficult to conjure.
Math is the hardest question, if you dont understand it.
What is the exact value of pi in figures.
I assume you mean "whole world" rather than "hole world". There is no "hardest math question" because one's field of knowledge may be different to another. Therefore, the hardest question for one person may be an easy one for others.
Different people find different problems hard and so it is not possible to answer the question.
Different people find different problems hard and so it is not possible to answer the question.
Different people find different problems hard and so it is not possible to answer the question.
Different people find different problems hard and so it is not possible to answer the question.
Prove that 2 <> 2. Show your working.
How much wood could a woodchuck chuck if a woodchuck could chuck wood?
Different people find different problems hard and so it is not possible to answer the question.
What is hard for some people may not be hard for others. So there is really no answer to this question.